Improvement in telegraphic instrument



S. G. CABELL. TBLEGRAPHIC INSTRUMENT.

No. 67,410. Patented Aug. 6, 186?.

@uiten tatrs @anni @ffice IMPROVEMENT IN IEIIEGRAPHIG INSTRUMENT.

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'ro ALL WHOM 1T MAY coNcERN;

Be it known that I, S. G. CABELL, of Quincy, in the county of Adams, andState of Illinois, have invented certain new and useful Improvements in'Ielegraphic Instruments; and I do hereby declare that the following visa full, clear, and exact description thereof,- reference being had tothe accompanying drawings, making part of this speciiication, and to theletters of reference marked thereon, like letters indiea'tinglike partswherever they occur.

To enableothers skilled in the'art to .construct and use my invention, Iwill proceed to describe it.

My invention consists in constructing a telegraph instrument with a.magnet ofia novel form, and so arranged in connection with theinstrument as to combine both a receiving instrument and a sounder inone and tbe same instrument, and having them so arranged that they canbe used separately or together at will.

Figure I is a side elevation of an instrument complete, ready foroperation.

Figure 2 is a longitudinal section of the magnet; and

Figure 3, a transverse section on the line :c of tig. I.

I construct my improved magnet by winding the insulated wire Z on acentral bar or tube of soft iron, as` represented by E, of iig. 2, andthen enclose or surround the helix with o. tube, D, also of soft iron.This tube D is made considerably longer than the core E, and projects atthe rear end thereof, leaving a cavity, which is filled by anotherhelix, Z, wound on a similar core, F, the cores E and F being placed inthe same plane, but having their adjoining ends separated by a smallspace, which is filled by a brass slidingepiece, i, which works to andfro through openings made for it in the sides o"the outer tube D. Thisslide h has a piece of soft iron, either solid or tubular, iilling ahole made through it at its central portion, as represented by z', thispiece of iront' being of such a size that when the slide is shoved so asto bring it in line with the cores E and F, it will be in contact withthe adjoining ends ot' each, and thus unite them.

The magnet, thus formed, is mounted on a stand on suitable restsb b, andenclosed by a stationary ring, C, in which it may be moved for a shortdistance to and fro, by means of a pinion, e. working in a rack, n,secured to the sheil D, the piniorbeing operated by a thumb-piece, a, asshown in iig. 2. To one end of the shell D is scoured a frame, o, inwhich is pivoted, at its bottom, a vibrating-arm` G, having an armature,t, attached to it, as shown in fig. l, the upper end of said arm Gplaying between and striking against the points of the set-screws 77 andr, held in position by a vertical arm, H, secured to the stand. `Attheopposite end of the magnet another vertical arm, 7c, is secured tothestand, and has pivoted to it another vibrating-arm, I, having anarmature, u, secured thereto, said arm I playing between and strikingagaiustset-screws fand g, as shown in iig. 1.

i Amagnet constructed on this plan is much stronger than the ordinaryhorse-shoe magnet, and it also loses its magnetism sooner than theordinary horse-shoe electro-magnet when the electric current is broken;

and hence it can beA operated with great rapidity.

In using my instrument, A is the relay-magnet, and it operates thevibrating-arm I, which may be so finely adjusted as to produce but verylittle if any sound, as is usually the case when sending messages over along line, or when the battery is weak. The connection between the mainline, which operates the arm I by means of the magnet A, and the ylocalbattery, which operates the sounder-arm G, is so made that the makingand breaking of the current with both magnets A and B will beaccomplished at one and the same operation, as is usual in the case ofreceiving instruments and Sounders;V and hence n-ll'vibrations ot` thearm I will be instantly duplicated or repeated by the sounder or arm G.By shoving the slide L so as to connect the cores E and F, the twomagnets A and B are caused to operate as a single magnet, with its polesat the outer ends bf E and F, by which means the power of the magnet isincreased and the sounder worked with more force.

It is obvious that the magnet maybe constructed on the same plan withtwo legs, like a horse-slice magnet,'

if desired; but the form here shown is simpler and cheaper, and is foundamply suiiicient for all ordinary purposes.

Having thus described my invention, what I claim, is-

1. Operating a telegraph insdzrument by means ot' a. magnet consistingof ahelix interposed between two concentric pieces of soft iron, theinner forming a central core, and the outer one a covering for thehelix, substantially as described. A

' 2. I claim the combination of the electro-magnets A and B with theconnecting piece t, arranged so that, by`moving it to and fro, themagnets may be connected or disconnected at will, substantially asdescribed.

3. I claim the combination ofthe magnet A, with its vibrating-arm I, andthe magnet B, with its vibratingarm G, when arranged to forni oneinstrument, and to operate as and for the purposes herein set forth.

s. e. cABnLL.

Witnesses:

GEO. H. Gmnnn, GILPIN Moena,

